I roast coffee. I have a
https://www.sweetmarias.com/product/behmor-1600-plus
roaster I use for 3/4 lbs batches for my sister. Friends of mine also roast coffee with this model and they have used it for doing nuts.
the drum comes out and is easily cleaned they say. they do have to watch the nuts carefully.
and I doubt anyone would get this just for nuts !
but that should give you and idea of what a drum roaster is that already exists.
good luck !
BTW since a sheet pan in the oven also works great, you've got a steep hill to climb to beat that
